@defmac define-advice symbol (where lambda-list &optional name depth) &rest body
This macro defines a piece of advice and adds it to the function named
-@var{symbol}. If @var{name} is non-nil, the advice is named
+@var{symbol}. If @var{name} is non-@code{nil}, the advice is named
@code{@var{symbol}@@@var{name}} and installed with the name @var{name}; otherwise,
the advice is anonymous. See @code{advice-add} for explanation of
other arguments.
safely be called at any time.
@item :wrap @var{wrap-p}
-If @var{wrap-p} is non-nil inside a tool bar, the menu item is not
-displayed, but instead causes subsequent items to be displayed on a
-new line. This is not supported when Emacs uses the GTK+ or Nextstep
-toolkits.
+If @var{wrap-p} is non-@code{nil} inside a tool bar, the menu item is
+not displayed, but instead causes subsequent items to be displayed on
+a new line. This is not supported when Emacs uses the GTK+ or
+Nextstep toolkits.
@end table
@node Menu Separators
The definition of a word is any sequence of consecutive characters that
are assigned to the word constituent syntax class in the current syntax
table (@pxref{Syntax Class Table}); if @code{case-symbols-as-words}
-is non-nil, characters assigned to the symbol constituent syntax
+is non-@code{nil}, characters assigned to the symbol constituent syntax
class are also considered as word constituent.
When @var{string-or-char} is a character, this function does the same
above). When @var{stream} is a buffer, the ellipsis will be given the
@code{cl-print-ellipsis} text property. The value of the text
property will contain state (including @var{start}) in order to print
-the elided part of @var{object} later. @var{start} should be nil if
-the whole @var{object} is being elided, otherwise it should be an
-index or other pointer into the internals of @var{object} which can be
-passed to `cl-print-object-contents' at a later time.
+the elided part of @var{object} later. @var{start} should be
+@code{nil} if the whole @var{object} is being elided, otherwise it
+should be an index or other pointer into the internals of @var{object}
+which can be passed to `cl-print-object-contents' at a later time.
@end defun
@defvar cl-print-expand-ellipsis-function
@end table
When @var{service} is not a known name but a unique name, the function
-returns nil.
+returns @code{nil}.
@end defun
When a name has been chosen, Emacs can offer its own methods, which
lull you into a false sense of familiarity.
When using command form (@pxref{Invocation}), Eshell will ignore any
-leading nil values, so if @var{foo} is @code{nil}, @samp{$@var{foo}
-echo hello} is equivalent to @samp{echo hello}.
+leading @code{nil} values, so if @var{foo} is @code{nil},
+@samp{$@var{foo} echo hello} is equivalent to @samp{echo hello}.
@table @code
@defun eshell-function-target-create output-function &optional close-function
Create a new virtual target for Eshell that repeatedly calls
@var{output-function} with the redirected output, as described above.
-If @var{close-function} is non-nil, Eshell will call it when closing the
-target, passing non-@code{nil} if the redirected command succeeded.
+If @var{close-function} is non-@code{nil}, Eshell will call it when
+closing the target, passing non-@code{nil} if the redirected command
+succeeded.
@end defun
@node Pipelines
function, it will be called in the message buffer without any
arguments, and the corresponding @var{method} will be inserted into
the message headers as the SMTP Method if the function returns a
-non-@code{nil} value; if @var{method} is nil, the value returned by
-the function @code{cond} is used instead.
+non-@code{nil} value; if @var{method} is @code{nil}, the value
+returned by the function @code{cond} is used instead.
@end table
Special cell values:
@itemize
-@item nil prints the same as "", but allows previous cell to spill over.
-@item '*skip* replaces nil when the previous cell actually does spill over;
-nothing is printed for it.
+@item @code{nil} prints typically the same as "", but allows previous
+cell to spill over.
+@item '*skip* replaces @code{nil} when the previous cell actually does
+spill over; nothing is printed for it.
@item '*error* indicates that the formula signaled an error instead of
producing a value: the print cell is filled with hash marks (#).
@end itemize
@defun vtable-insert-object table object &optional location before
Insert @var{object} into @var{table}. @var{location} should be an
object in the table, the new object is inserted after this object, or
-before it if @var{before} is non-nil. If @var{location} is @code{nil},
-@var{object} is appended to @var{table}, or prepended if @var{before} is
-non-@code{nil}.
+before it if @var{before} is non-@code{nil}. If @var{location} is
+@code{nil}, @var{object} is appended to @var{table}, or prepended if
+@var{before} is non-@code{nil}.
@var{location} can also be an integer, a zero-based index into the
table. In this case, @var{object} is inserted at that index. If the
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